feat(blog): implement tag filtering and facets endpoint

- Fix tag filtering to correctly match Persian tags by adjusting JSON encoding in the applyTagFilter method.
- Add new endpoint GET /api/v1/blogs/tags to retrieve distinct tag names and their counts for published posts, respecting city scope.
- Update API documentation to reflect changes in tag filtering and the new tags endpoint.
- Create BlogTagFilterTest to ensure correct functionality of tag filtering and facets, including edge cases for Persian tags and city filtering.

config/packages/security.yaml

@@ -37,7 +37,7 @@ security:
         # مجاز) و هم برای پنل مدیریت (توکن معتبر → احراز می‌شود تا management=1 کار کند)
         # سرویس می‌دهد. برای همین از الگوی زیر خارج شده‌اند.
         public_endpoints:
-            pattern: ^/(api/v1/altcha/(challenge|config)$|api/v1/user/(send-code|verify-code|register|otp-login|reset-password)|oauth/token$|session/token|api/v1/categorys/|api/v1/doctors$|api/v1/clinics$|api/v1/clinic/doctor-list/|api/v1/clinic/[^/]+/addresses$|api/v1/clinic-pro/doctor-addresses/|api/v1/appointment-booking-services/|api/v1/comments/|api/v1/rate/[^/]+$|api/v1/specialties|api/v1/blogs$|api/v1/tags$|api/v1/clinic-invitation/|api/v1/pre-registration$|api/v1/doctor/[^/]+/claim-info$)
+            pattern: ^/(api/v1/altcha/(challenge|config)$|api/v1/user/(send-code|verify-code|register|otp-login|reset-password)|oauth/token$|session/token|api/v1/categorys/|api/v1/doctors$|api/v1/clinics$|api/v1/clinic/doctor-list/|api/v1/clinic/[^/]+/addresses$|api/v1/clinic-pro/doctor-addresses/|api/v1/appointment-booking-services/|api/v1/comments/|api/v1/rate/[^/]+$|api/v1/specialties|api/v1/blogs(/tags)?$|api/v1/tags$|api/v1/clinic-invitation/|api/v1/pre-registration$|api/v1/doctor/[^/]+/claim-info$)
             stateless: true
             security: false
 
@@ -75,6 +75,7 @@ security:
           methods: [GET]
           roles: PUBLIC_ACCESS
         - { path: ^/api/v1/blogs$,                         roles: PUBLIC_ACCESS }
+        - { path: ^/api/v1/blogs/tags$,                    methods: [GET], roles: PUBLIC_ACCESS }
         - path: '^/api/v1/blog/[^/]+$'
           methods: [GET]
           roles: PUBLIC_ACCESS